Manufactured years 1955-56

Fitted wit aluminium bodywork, as opposed to the standard steel bodywork utilized on the standard production  Gullwings.

In addition to the bodywork, all cabin windows (except for the windshield) utilized Plexiglas, which helped to reduce 209 pounds of weight over the steel-bodied model. 

The changes to the Alloy Gullwings improve their performance  and included the fitment of the NSL-spec engine, utilizing a competition camshaft, higher compression, unique butterfly throttle valve, and recalibrated fuel distributor to deliver in excess of 215 horsepower. Rudge wheels, optional on steel-bodied 300 SL Gullwings, were fitted as standard, alongside special ventilated front brake drums. Modifications were also done to the suspension with new springs and shocks to provide better high-speed handling. 

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